nuchalis, Arius Günther [A.] 1864:171, Fig. [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Guyana. Syntypes: (at least 6) BMNH 1975.1.17.3-5 (3), BMNH 2005.5.17.1-2 (2). Type catalog: Ferraris 2007:41 [ref. 29155]. •Valid as Arius nuchalis Günther 1864 -- (Burgess 1989:169 [ref. 12860]). •Species inquirenda in Cathorops Jordan & Gilbert 1883 -- (Marceniuk & Ferraris in Reis et al. 2003:450 [ref. 27061], Marceniuk & Menezes 2007:46 [ref. 29031], Ferraris 2007:41 [ref. 29155]). •Valid as Cathorops nuchalis (Günther 1864) -- (Marceniuk et al. 2012:78, 93 [ref. 31865], Marceniuk et al. 2023:14 [ref. 40422]). Current status: Valid as Cathorops nuchalis (Günther 1864). Ariidae: Ariinae. Distribution: South America: Caribbean coast of Venezuela to Guyana. Habitat: freshwater, brackish, marine.